Merge "Prevent starting split pending transition when it exists" into udc-dev am: 56557a6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22221903



Change-Id: Ifdbf2b5ca9229998b613e9293b03aa7f06d1f963
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>